<%= table_for @npw do |t|
  t.column :id 
  t.column :first_name 
  t.column :last_name 
  t.column :category 
  t.column :year 

  t.filter :category,
    collection: '<option>Chemistry</option><option>Literature</option><option>Peace</option><option>Physics</option><option>Physiology or Medicine</option>',
    multiple:   true
end %>
